support condition in service

include/test/Service.h

@@ -32,6 +32,7 @@ namespace xs { namespace test
 
     public:
         std::string name_;
+        boost::optional<nlohmann::json> condition_;
         boost::optional<nlohmann::json> response_;
     };
 } }

src/test/Service.cc

@@ -14,6 +14,10 @@ namespace xs { namespace test
     {
         if (object.count("command")) {
             response_ = object["response"];
+
+            if (object.count("condition")) {
+                condition_ = object["condition"];
+            }
         }
     }
 
@@ -23,9 +27,18 @@ namespace xs { namespace test
             return false;
         }
 
+        static const auto isStringOrObject = [](const nlohmann::json& object) {
+            return object.is_string() || object.is_object();
+        };
         if (object.count("command")) {
+            if (object.count("condition")) {
+                if (!isStringOrObject(object["condition"])) {
+                    return false;
+                }
+            }
+
             return object["command"].is_string()
-                && (object["response"].is_string() || object["response"].is_object())
+                && isStringOrObject(object["response"])
                 ;
         } else if (object.count("event")) {
             return object["event"].is_string();